Silly guess: did you restart postfix if you reinstalled it with USE=sasl?
(Note: I'm a sendmail + sasl user ... so only can give general suggestions...)_________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed watching?

And "equery uses postfix" indeed indicates that you compiled with USE=sasl?

Does this

Code:

$ postconf -a

report SASL support?

The auth command necessarily needs to be part of postfix, so postfix is compiled wrong, somehow... Unless it can take plugins.
http://www.postfix.org/SASL_README.html_________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed watching?

Well, it's not telnet that's the issue, it's just faking a MUA/MTA for debug. Somehow postfix is not able to use sasl properly and I don't know why... This is starting to get into postfix-specific issues and I'd have to install postfix on one of my machines to play with..._________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed watching?